Small tonnage electric overhead travelling cranes are often used in machinery manufacturing, assembly, warehouses and other places. The tonnage is generally less than 50 tons, but the working intensity is no less than that of large tonnage lifting equipment.

La grúa puente, el nombre completo es grúa puente eléctrica, es una grúa ligera. El puente grúa se compone de un mecanismo de elevación, un mecanismo de operación del carro y un marco del carro. El mecanismo de elevación incluye motor, freno, reductor, tambor, bloque de polea, etc. El motor impulsa el tambor para que gire a través del engranaje reductor, de modo que el cable metálico se enrolle alrededor del tambor o se deje caer desde el tambor para levantar objetos pesados.

Single girder eot crane is consisting of the main beam, end beam, electric hoist, travelling mechanism, hand controller, and electrical control system. The electric hoist can move horizontally on the rail fitted under a beam. The electric overhead travelling crane holds many characters of light structure, easy to install and maintain, which is typically used for either manufacturing or maintenance applications where efficiency or downtime are critical factors, for instance, plants, warehouses, or material stocks.

Each contactor and the main and auxiliary contacts of the relay should be checked regularly. If any singeing occurs, they should be smoothed with fine sandpaper. If severe, they should be replaced.

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